Pulverizer-mill yoke and pusher.



w s, McKEE. PULVERIZER MILL YOKE AND PUSHER. APPLICATION FILED JAN.15|19 16.

1,186,214. Patented J une 6,1916.

2 SHEETS-SHEET l.

THE COLUMBIA FLANOGRAPH co., WASHINGTON, n. c.

W. S. MclKEE.

PULVERIZER MILL YOKE A ND PUSHER.

APPLICATION FILED JAN-15, 1916.

IIIIIIIII IIJ Patented J 1111 6, 1916.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE.

WALTER S. MCKEE, OF CHICAGO, ILLINOIS, ASSIGNOR T AMERICAN MANGANESESTEEL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF MAINE.

PULVERIZER-MILL YOKE AND PUSHER.

Application filed January 15, 1916.

To all whom it may concern.

Be it known that I, l/VALTEP. S. MGKEE, a citizen of the United States,and a resident of Chicago, in the county of Cook and State of Illinois,have invented certain new and useful Improvements'in PulveriZer-MillYokes and Pushers, of which the following is a specification.

My invention relates to grinding mills and has particular reference toan improvementin the form of the yoke and pusher of a pulverizer mill.

In mills of this description it will be understood that the grinding isaccomplished by means of a plurality of large, heavy forged steel ballswhich are caused to travel at a high speed in a horizontal circularpath, the balls being thrown or urged outwardly against the grindingring by centrifugal force, and the grinding being accomplished betweenthe balls and the grinding ring. Such mills are commonly used forgrinding clinker 1n the production of cement. It will be understood thatin such mills means must be provided for causing the balls to travel,the means commonly employed comprising a plurality of spaced arms towhich a pusher shoe is applied, this shoe fitting over the end of thearm. It will be understood that but one side of this shoe contacts theball and that the wear at this point is quite severe necessitating therenewal of the shoes at frequent intervals. In the means heretoforeemployed the scrap from the shoes has been great, the amount worn offbeing relatively small in comparison to the entire body of the shoe orpusher.

An object in the present construction is to provide a pusher soconstructed that it may be substantially entirely worn out before beingdiscarded, thus reducing the. amount of metal necessary to be scrapped.

The invention will be more readily understood by reference to theaccompanying drawings wherein Figure 1 is an irregular section through apulverizer mill, the view being taken on the line 11 of Fig. 2; Fig. 2is a sectional plan view taken on the line 22 of Fig. 1. Fig. 3 is anenlarged fragmentary front elevation of one of the arms and pushershoes, the shoe being shown as applied to the opposite side of the arm:Fig. 4 is a plan view of the same with a portion of the arm broken awayto show the form of connection Specification of Letters Patent.

Patented June 6, 1916.

Serial No. 72,206.

to the shoe; Fig. 5 is a view similar to Fig. 8, showing a slightmodification, the shoe likewise being shown in its reversed position,and Fig. 6 is a plan view of the construction shown in Fig. 5.

Referring to the drawings it will be seen that only a portion ofthepulverizer mill is shown. The intermediate section 10 is intended torestupon and be supported by a bottom section. The intermediate portionprovldes a horizontal shelf 11 upon which the grinding ring 12 ismounted. The axial center portion of the shelf 11 is verticallydisplaced to form a cone 18. A hub let is formed at the center of thecone, this hub accommodating the mill shaft 15. The grinding balls 16,of which four are shown, are retained in place by the grinding ring andthe side walls of the cone 13.

superposed on the intermediate section is the top section 17 having avertical annular flange 18 which provides means of attachment for theoutside casing or shell 19. The top section is provided with verticalportions 20 to which screen plates 21 are secured.

As best shown in Fig. 2, the yoke comprises the hub portion 22, radialpusher arms 23, and fan blade brackets 21, the pusher arms and bracketsbeing equally spaced around the periphery of the hub 22, the brackets,however, being located at a considerable elevationabove the pusher arms.A cylinder 25 is secured to the fan blade brackets and to this cylinderthe fan blades, not shown, are secured. The hub 22 of the yoke isprovided with a squared aperture at the axis thereof which engages ayoke support 26, keyed to the mill shaft 15, the yoke and yoke supportbeing provided with a cooperating abutment and shoulder 27 by which theyoke is supported.

The pusher arms 23, as best shown in Figs. 3 and a, are preferablysymmetrical about their longitudinal axes, of H shape in cross sectionand are enlarged at their ends as at 28, the side of the arm forming atriangular space 29 for a shoe 30 adapted to engage and cause the travelof the balls 16. The face of the shoe will be preferably slightlyconcaved as indicated at 31 to conform somewhat to the contour of theball. The pusher arms at the base of the triangular enlargement 28, areprovided with horizontal and vertical transverse apertures 32, 33. The

aperture 32 accommodates an integral lug 34 on the shoe 31, this lugbeing apertured to register with the aperture 33 in the arm and toaccommodate a pin or key which serves to retain the shoe in its properposition.

In the constructions of Figs. 5 and 6 the pusher arms 37 are eachprovided with a horizontal transverse aperture 38 enlarged at 39 toaccommodate a lug 40 on the shoe 41. A counter sunk fastening bolt 42passes through the shoe, the lug 40, and the aperture 38 in the arm, andserves to secure the shoe in place.

It will be noted that the pusher arms 23 are symmetrical about a centerline transverse of the vertical shaft, and that the shoes are sodesigned as to be applied to either side of the arms. In certaininstances it. may be found desirable to operate the mill in a reversedirection, in which case the shoes may be readily applied to theopposite sides of the arms.

It will be seen that a pusher shoe constructed and applied as shown maybe practically entirely worn out before being discarded, and thattherefore the loss in scrap will be slight.

In the operation of the mill the shaft 15 is rotated by suitable meansthus causing the rotation of the yoke through the engagement of the hub22 with the squared yoke support 26. The pusher arms and their attachedshoes engage the balls 16 causing their rapid travel in a circular pathas defined by the grinding ring 12.

Obviously the form of attachment of the shoe to the pusher arm, as wellas the form of the shoe, will be modified to suit difierent conditions,and such modifications as are within the scope of my claims I considerwithin the spirit of my invention.

I claim:

1. In a mill of the class described, the cornbination of a plurality ofradial arms, the ends of which are enlarged, and which arms aresubstantially symmetrical about their longitudinal axes, therebyproviding a triangular seat on each side of said arms, a shoe adapted tobe fitted on either side of said arms and means for securing said shoein either of the seats in said arms, substantially as described.

2. In a grinning mill, the combination of a plurality of radial arms,the ends of which are flared and which arms are substantiallysymmetrical about their longitudinal aXes, thereby providing an angularseat on each side of said arms, each of said arms being provided with athrough horizontal and an intersecting vertical aperture, a shoe adaptedto be fitted in either of said seats and provided with a projectionadapted to enter said horizontal aperture, and fastening means occupyingsaid vertical aperture, substantially as described.

3. In a grinding machine, the combination of a plurality of radial armsof substantially H shape in cross section, the ends of which areenlarged to provide an angular seat, a shoe adapted to occupy said seat,and fastening means for said shoe adapted to be passed verticallythrough said arm and said shoe, substantially as described.

l/VALTER S. MCKEE. lVi tnesses EUGENE C. BAUER, HARRIET J. HALPIN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

